We have two outstanding SCRs related to this. One is to allow you to set the resolution when saving to a file. The other is to add a drop down menu exposing the options for exporting. In the meantime,, when using the Save Screenshot feature of magic sheets, change the image format from .png to .svg. An svg image will scale to any resolution without looking fuzzy, and would be much better for printing. (You can open SVG images files with any web browser, or free image editors such as Inkscape).
Hope that helps.
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